Heat frying pan over medium-high heat and add a small amount of butter. Crush the cornflakes and combine the crumbs with almonds in a bowl. Combine eggs, vanilla extract and cinnamon in another bowl and whisk.

Dip 1 slice bread in egg batter, then coat on both sides with cornflake crust; repeat with remaining bread slices.

Coarsely mash the bananas and spread on 1 side of half of the slices; top with the remaining half of the slices to make banana "sandwiches". Cook sandwiches on the frying pan until golden brown. Cut in half in triangles and serve.